A hand loaders dies are precision tools, but how seldom they get treated as such. Folks who might spend hours cleaning their rifles after a range day can somehow ignore the very tools they use to keep those rifles operating.
Tearing down a reloading die is not hard; usually nothing more than unscrewing a few things. Cleaning the tooling is not hard either, and anyone with a decent gun cleaning kit already has the things required to do it.
A couple shots of CLP or solvent, a little scrubbing with a bore brush, and then a rinse with gun scrubber or brake clean. Follow up with a light coat of gun oil, or more CLP..... and they are done.
Treat your dies like the fine precision tooling they are, and they will last a lifetime!